I've got a "simple" situation that I figured would be easy, but it's not working. I've attached a topology diagram for reference.
I've got routes from the "RTA" router that are advertised to ISP. The RTA router sees two paths to RTB: through ISP and through OM.
RTB only sees one path to 192.168.1.0 (RTA), and that's through the ISP. All BGP neighbors are up, and these are all eBGP peers. The OM router has the route for 192.168.1.0/24 in it's table through 172.16.1.1 (RTA), but OM isn't advertising that route to RTB.
I need to have RTA accessible over the OM link in case the link between RTA and ISP goes down. I was going to modify the ASPath to do this, but it does no good if I'm not getting the routes to RTB. =)